Alloy



Fatented ct. 2%, E22.

stares AECHIBALD E. COPLAIQ', GE @T'EAWA, ONTARIO, CANADA.

E0 Drawing. t.

To all whom it may concern:

Be it known that l, ARCHIBALD H. ()0?- LAN, a citizen of the Dominionor" Canada, residing at @ttawa, in the county of Carleton and Provinceof Ontario, Canada, have invented certain new and useful Improvements inAlloys, of which the following is a specification.

My invention relates to an alloy, and provides a material which ispartlcularly designed for um in grate bars.

The object of my invention is to provide an alloy having constituents ofmetals, one of which is used in certain percentages to resist the heatradiated from the coal or other fuel being burnt on such grate bars.

A further object is to provide an alloy having constituents of-metals,one of which is used in certain percentages to close the grain of thealloy so tight as to prevent the taking in to the composition anysulphur or other weakening elements from the coal or other fuel.

having constituents A further object is to provide an allo of metals,one of whic is used in certain warping by the grain of the compositionbeing closed against receiving therein sulphur or other weakeningelements from the have been made,

coal or other fuel.

A further object is to havin constituents of metals, one of whic is usedin certain percentages to prevent the oxidizing of the grate bars, and,therefore, extending its life and usefulness.

A further object is to provide an alloy having constituents of metals,one of which is used in certain percentages to prevent cracking bycontraction or expansion when used in combustion chambers. V

appreciate that compositions of alloy provide an allo Application filed5?, 195333.

' more efficient and have percentages to prevent using the same metalsin Serial It's. stones.

phur .05% and under, phosphorus .05% and under, and silicon 35% to 50%.The sulphur, phosphorus and silicon will vary slightly and are wellknown in general foundry practice.

Under severe tests, I have found that grate bars made from this alloyhave proven lasted much longer. Chromium in the percentages above statedhas been found to resist the heat radiated from the fuel and at the sametime close up the grain of the alloy so tight'as to prevent any sulphuror other weakening ele ments to be taken in from the coal-or other fuel.This prevents any warping of the grate bars on account of theseundesirable elements being excluded.

The percentage of the nickel is found to fully prevent oxidizing of thegrate bars under excessive heat. In other alloys, it has beenexperienced that the oxidizing. owing to the improper percentage ofnickel will cause oxidizing and thus prove most ineilicient.

In other alloys, different percentages of carbon have been used, but forthe particular purpose for which this alloy has been designed, the lowamount is sufiicient for the purpose for which it is designed, and if a'higher carbon was used, it would be detrimental. A low carbon, incombination with other constituents provides an alloy, in which thecarbon prevents cracking when the grate bars are under contraction orexpanslon.

What I claim as new is:

1. An article, which in use is exposed to combustion conditions,composed of an alloy embodying chromium approximately 1%, nickelapproximately 2%, manganese not less than .60%, carbon not less than.10%, and iron with sulphur and phosphorus in small quantities.

2. A grate bar formed of an alloy embodying chromium approximately 1%,nickel approximately 2%, manganese not less than .60%, carbon not lessthan .10%. iron with sulphur and phosphorus in small quantities, andsilicon not less than .35%.

. In testimony whereof I afiix my signature in the presence of twowitnesses.

ulll H. COPL

